100TECH 4" Marine Fuel Tank Sending Unit (240-33 Ohms)
Imagine never worrying about running out of fuel on the water again. The 100TECH 4" Fuel Sending Unit gives you accurate, real-time fuel level readings — built tough for marine, RV, truck, and off-road use.
Why Choose 100TECH?
- OKI Reed Switch (Made in Japan) – Superior durability with no thick-film wear-out issues
- [Finer Resolution] – Short tanks require higher sensitivity. The 4", 5", 5.5", 6", 7", 7.5" units feature 10mm resolution, delivering more continuous and accurate fuel level readings than standard 21mm resolution units.
- 316 Stainless Steel Body – Corrosion-resistant, built for harsh marine environments
- No Moving Parts to Break – Float is the only moving component, minimizing mechanical failure
- American Standard Output: 240-33 Ohms – 240Ω at empty, 33Ω at full; compatible with most marine gauges
- SAE Standard 5-Hole Mounting Pattern – Direct replacement for arm-type senders and original Wema units
- IP67 Protection Rating – Sealed against dust and water jets
- Easy Installation – Comes with gasket, 5x M5 screws, and illustrated instructions
- Wide Application – Fuel or water level sensing for boats, RVs, trucks, generators, and industrial equipment
Specifications
- Length: 4" (100mm)
- Material: SUS 316 Stainless Steel body, PVC cable, NBR float
- Output Signal: 240-33 Ohms (American Standard)
- Mounting: SAE 5-hole pattern
- Operating Temperature: -40°F to +85°F (-40°C to +85°C)
- Float Diameter: 1.38" (35mm) — recommended hole size: 1.50" (38mm)
Package Contents
- 1x 100TECH Fuel Sending Unit (4")
- 1x Neoprene Gasket
- 5x M5×0.8 (16mm) Screws
- 1x Installation Guide
Installation Tip: For plastic tanks, sender length should be 1" less than tank depth. For metal tanks, 0.5" less than tank depth.
Warranty: 1-Year Limited Warranty + Free Lifetime Technical Support